ERROR Error: Cannot call .tap() on a plugin that has not yet been defined. Call plugin('preload').use(<Plugin>) first.

这个错误的原因是在调用.tap()方法之前没有先定义插件。根据提供的解决办法，你可以在vue.config.js文件中添加以下代码来解决这个问题：

module.exports = {
chainWebpack(config) {
config.plugin("preload").tap(() => [
{
rel: "preload",
fileBlacklist: [/\.(?:map|hot-update)\.(?:js|css)$/, /runtime\..*\.js$/],
include: "initial",
},
]);
config.plugin("preload-index").tap(() => [
{
rel: "preload",
fileBlacklist: [/\.(?:map|hot-update)\.(?:js|css)$/, /runtime\..*\.js$/],
include: "initial",
},
]);
config.plugin("preload-qr").tap(() => [
{
rel: "preload",
fileBlacklist: [/\.(?:map|hot-update)\.(?:js|css)$/, /runtime\..*\.js$/],
include: "initial",
},
]);
},
};

以上代码会在webpack配置中定义三个插件，并在调用.tap()方法之前先定义了这些插件，从而解决了错误。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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